/* NOTICE
    OpenJaWS - Open Java Weather Station
    
    Copyright (C) 2008 Grant Gardner <grant@lastweekend.com.au>
    
    OpenJaWS is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
NOTICE */
package au.com.lastweekend.openjaws.units;

public enum SpeedUnit implements Unit {

    METRES_PER_SECOND(DistanceUnit.METRE, TimeUnit.SECOND),
    KILOMETRES_PER_HOUR(DistanceUnit.KILOMETRE, TimeUnit.HOUR),
    MILES_PER_HOUR(DistanceUnit.MILE, TimeUnit.HOUR, "mph"),
    KNOT(DistanceUnit.NAUTICAL_MILE, TimeUnit.HOUR, "kt");

    private double multiplier;
    private String utfSymbol;

    private SpeedUnit(String symbol) {

        this.multiplier = -1;
        this.utfSymbol = symbol;
    }

    private SpeedUnit(DistanceUnit distUnit, TimeUnit timeUnit, String symbol) {

        this.multiplier = distUnit.getMultiplier() / timeUnit.getMultiplier();
        this.utfSymbol = symbol;
    }

    private SpeedUnit(DistanceUnit distUnit, TimeUnit timeUnit) {

        this(distUnit, timeUnit, distUnit.toString() + "/" + timeUnit.toString());
    }

    public double convertFrom(double value, Unit unit) {
        SpeedUnit unitFrom = (SpeedUnit) unit;
                
        return value * unitFrom.multiplier / multiplier;
 
    }

    public String toString() {

        return utfSymbol;
    }

}
